I was fortunate to first see In Bruges in a philosophy class. The trailer uses music to play up marketability, but you see a basic idea of the humor, and even see that >!Ray killed a little boy!<, which should tell you that this is going to be very dark and fucked up.

Truly one of the greatest moments of situational irony portrayed on screen.

It is a dark humor crime comedy, though…. Perhaps we could argue that it’s so absurdist and violent that it crosses from dark humor to black humor.

Maybe you have to be a bit depressed/nihilistic to laugh at Martin McDonagh films, but I find them uproariously funny while also being a bit philosophical. You not finding it funny seems to just be a matter of taste and, perhaps, intellect.